# Features- Click-to-play plugin areas have a close box now.# Fixes - WebRTC has been disabled on MacOS X for now .- Fixed autosync not correctly detecting message offline status, resulting in poor Gmail IMAP performance.- Special mail folder icons (Inbox, Trash etc.) were not shown for shared IMAP folders.- Help has been updated for the redesigned Add-ons Manager.- The MailNews filter editor can now show the actual execution order of actions.- The Privacy & Security Preferences UI has been reworked (User Tracking and Safe Browsing preferences have been added and a Private Data sub-category has been introduced).- First time after choosing to "Never activate plugins for this site", videos were still playing.- User-oriented labels for Strict Transport Security have been added to the Data Manager .- The Google search bar favicon has been updated.- Base64-encoded attachments are now detected irrespective of the case used.- Saving messages to disk could fail silently.- Some dangerous file system folders are now disallowed to be used as the Local Directory for mail storage.